Plugin config cleanup.

pkg/analyzer/lib/src/plugin/plugin_configuration.dart

Index: pkg/analyzer/lib/src/plugin/plugin_configuration.dart
diff --git a/pkg/analyzer/lib/src/plugin/plugin_configuration.dart b/pkg/analyzer/lib/src/plugin/plugin_configuration.dart
index 6d5a102a80ce607d2c0c128734c51a2fe92c11e3..e4512fb160936af8e7b9b0b13d69193efa71b283 100644
--- a/pkg/analyzer/lib/src/plugin/plugin_configuration.dart
+++ b/pkg/analyzer/lib/src/plugin/plugin_configuration.dart
@@ -30,15 +30,6 @@ PluginInfo _processPluginMapping(dynamic name, dynamic details) {
   return null;
 }
 
-PluginInfo _processPluginNode(dynamic node) {
-  if (node is YamlMap) {
-    if (node.length == 1) {
-      return new PluginInfo(name: node.keys.first, version: node.values.first);
-    }
-  }
-  return null;
-}
-
 typedef ErrorHandler(Exception);
 
 /// Describes plugin configuration information as extracted from an